Studies Reveal More Chlorine Risks, Including Cancer

Research linking swimming in chlorinated pools to cancer and other medical conditions continues to make headlines. The latest such studies come from the Centre for Research in Environmental Epidemiology in Barcelona, Spain. They indicate, among other things, that swimming in a pool with chlorine may increase the risk of developing cancer and damage lungs. The studies, published this week in the journal Environmental Health Perspectives, also identified more than 100 chemical byproducts in pools that use chlorine as a disinfectant. But lead scientists in the studies are quick to admit that their research sample was small, and they stress that more research is necessary before drawing sweeping conclusions.


Here is a rundown of findings by the center's researchers: • In one study, scientists collected blood, urine and exhaled air samples from 49 non-smoking adults before and after they swam for 40 minutes in an indoor chlorinated pool. Researchers found that, after swimming, concentrations of four biomarkers (used as indicators of specific biological states) suggested toxicity from disinfection byproducts that can lead to cancer.

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